21335077 has 4 divisors (see below), whose sum is σ = 21351456. Its totient is φ = 21318700.

The previous prime is 21335071. The next prime is 21335101. The reversal of 21335077 is 77053312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21335077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21335071) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6049 + ... + 8902.

It is an arithmetic number, because the mean of its divisors is an integer number (5337864).

Almost surely, 2^21335077 is an apocalyptic number.

It is an amenable number.

21335077 is a deficient number, since it is larger than the sum of its proper divisors (16379).

21335077 is a wasteful number, since it uses less digits than its factorization.

21335077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16378.

The product of its (nonzero) digits is 4410, while the sum is 28.

The square root of 21335077 is about 4618.9909071138. The cubic root of 21335077 is about 277.3520657278.

Adding to 21335077 its reverse (77053312), we get a palindrome (98388389).

The spelling of 21335077 in words is "twenty-one million, three hundred thirty-five thousand, seventy-seven".